桥梁碰撞振动台试验及参数敏感性分析

发布时间：2018-01-01 15:19

本文关键词：桥梁碰撞振动台试验及参数敏感性分析　出处：《长安大学学报(自然科学版)》2016年04期 　论文类型：期刊论文

【摘要】：为研究桥梁结构在地震作用下的碰撞数值模拟方法和碰撞响应特点,设计制作了4组简化碰撞结构试件,进行了振动台试验;将线弹性、Kelvin-Voigt、Hertz、Jan-Hertz-damp这4种接触单元模型引入数值模拟分析中,对试验结果进行数值验证;并进行了桥梁结构碰撞参数敏感性研究。研究结果表明:Jan-Hertz-damp接触单元模型数值模拟精度最高,但计算时间相对较长;在桥梁伸缩缝处设置接触刚度较小的材料,以及增加桥梁结构自身阻尼和相邻联阻尼比差别,都可降低桥梁结构碰撞力响应;随着伸缩缝宽度的增大,碰撞力总体上是减小的;碰撞力响应与桥梁联跨自身动力特性、输入地震波的峰值以及频谱分布有关。
[Abstract]:For study on the collision of bridge structure under earthquake numerical simulation method and collision response characteristics, designed 4 groups of simplified collision specimens, shaking table tests are conducted; the elastic, Kelvin-Voigt, Hertz, Jan-Hertz-damp these 4 kinds of contact element model was introduced into the numerical simulation analysis, to validate the test results; and the sensitivity of the bridge structure collision parameters. The results show that: Jan-Hertz-damp contact element model for numerical simulation of the highest precision, but the computation time is relatively long; joint set contact stiffness is small materials in bridge expansion and increase the bridge structure itself and the adjacent joint damping damping ratio difference, can reduce the collision force response of bridge structure with the increase of the width of the expansion joint; on the whole, the collision force is reduced; the collision force response and bridge span its dynamic characteristics, the input of seismic wave and peak frequency The spectrum distribution is related.

【作者单位】：西安建筑科技大学土木工程学院;
【基金】：国家自然科学基金项目(51078306,51408453) 高等学校博士学科点专项科研基金项目(20106120110004,20136120120022)
【分类号】：U446
【正文快照】： 0引言地震作用下的桥梁结构,相邻联梁体以及主梁与两侧桥台之间会发生相互碰撞,这主要是由于相邻联存在结构动力特性差异,地震时会引起不同步运动,当预留的伸缩缝间隙不能满足彼此相对位移时就会发生碰撞,碰撞会导致桥梁伸缩缝挤压、主梁梁端开裂、支座失效、桥台胸墙局部混凝

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